<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button class="btn1">存localstorage</button>
    <button class="btn2">获取localstorage</button>
    <button class="btn3">删除localstorage</button>
    <button class="btn4">删除所有的localstorage</button>
    <script>
      // cookie:离线存储 ：cookie 数据量小 ，占用网络；存小数据量
      // 数量相对来说大些 localStorage 本地存储  5M
      // localStorage : 1.设置localstorage  2.获取localstorage 3.删除  没有时效性；
      // 1.设置
      document.querySelector(".btn1").onclick = function () {
        // localStorage.setItem("name","张三");
        // localStorage.setItem("age",18);
        let arr = [{ name: "沙口" }, { name: "函皮" }];
        // localStorage.setItem("arr",arr);
        localStorage.setItem("arr", JSON.stringify(arr));
      };
      // 获取
      document.querySelector(".btn2").onclick = function () {
        let res = localStorage.getItem("arr");
        console.log(JSON.parse(res));
        //   console.log(res);
      };
      // 删除 指定的localstorage
      document.querySelector(".btn3").onclick = function () {
        localStorage.removeItem("name");
      };
      // 删除所有的localstorage
      document.querySelector(".btn4").onclick = function () {
        localStorage.clear();
      };
    </script>
  </body>
</html>
